In soldering with lead-based solders (i.e. HMP, >90%Pb) is it 
     essential to pretin the components lead with a high Pb alloy for 
     component leads that are Sn85/Pb15 or Sn80/Pb20 plated, Sn60/Pb40 or 
     Sn63/Pb37 coated, and what about gold-plated? 
     
     What are the pro's/con's of not pretinning, undestanding the 
     propensity of leads (Pb) and tins (Sn) to lower the melting 
     points..How much I am not sure ! Is there a distinct advantage OF 
     pretinning with Pb ?
     
     One other note, the storage temps will be greater than 190degC.
     
     Thanks
     Darrell